ASTM D7415-21 用傅里叶变换红外光谱法（FT-IR）趋势分析法对在用石油和碳氢化合物基润滑剂中硫酸盐副产品进行状态监测的标准试验方法.pdf

This international standard was developed in accordance with internationally recognized principles on standardization established in the Deision on Principles for the Development of International Standards Guides and Remendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Designation:D7415-21 INTERNATIONAL StandardTestMethodfor ConditionMonitoringofSulfateBy-ProductsinIn-Service PetroleumandHydrocarbonBasedLubricantsbyTrend AnalysisUsingFourierTransformInfrared(FT-iR) Spectrometry This standard is issued under the fixed designation D7415; the number immediately following the designation indicates the year of original apiorasfrevisn er flst revisieprethndcat th yarf lstrapprval superscript psilon (e) indicates an diorial change since the last revision or reapproval. 1.Scope* for a single measurement or alternatively can be based on a 1.1 This test method covers monitoring sulfate by-products rate of change of the response measured see Ref (1）. in in-service petroleum and hydrocarbon based diesel crank- 1.4.1 For direct trend analysis values are recorded directly caseengineandmotoroilsthathaveasulfurcontentofgreater from absorption spectra and reported in units of absorbance per than 500 ppm. This test method should not be employed when 0.1 mm pathlength. low-sulfur fuels are used for bustion. 1.4.2 For differential trend analysis values are recorded from the differential spectra (spectrum obtained by subtraction 1.2 This test method uses Fourier Transform Infrared (FT- of the absorption spectrum of the reference oil from that of the IR) spectrometry for monitoring build-up of sulfate by- in-service oilandreported in units of 100*absorbance per products in in-service petroleum and hydrocarbon based lubri- 0.1 mm pathlength (or equivalently absorbance units per cen- cants as a result of normal machinery operation. Sulfate timetre). by-products can result from the introduction of sulfur from 1.4.3 In either case maintenanc...